The TVR Speed 12, originally known as the Project 7/12 was a very high performance concept vehicle designed by TVR in 1997. Based in part on then-current TVR hardware, the vehicle was intended to be both the world's highest performance road car and the basis for a GT1 class Le Mans racer. Unfortunately, problems during its development, changing GT1 class regulations and the eventual decision that it was simply incapable of being used as a road car ended the idea, forcing TVR executives to abandon its development.
In an interview Peter Wheeler, who owned TVR during the car's development, said that TVR had tried to record the car's power on an engine dyno. The dyno was rated at 1000 bhp but the test resulted in the dyno's input shaft being broken. To get an approximate figure TVR engineers tested the engine again but they tested each bank individually; the result was 480 bhp per bank. This would suggest a rating of 960 bhp in total. Although this didn't provide an exact figure, it was far closer than the original estimates were. The real figure is still unknown. Peter Wheeler drove one of the finished prototypes home and he concluded that the car was unusable on the road, in his opinion it was simply too powerful. Wheeler was no newcomer to high performance cars, he even raced in the TVR Tuscan challenge for a number of seasons.